temperature = int(input())
if temperature >= 30:
    print ("Yes")
else:
    print("No") temperature = int(input()) temperature int(input()) int input() input if temperature >= 30:
    print ("Yes")
else:
    print("No") temperature >= 30 temperature 30 print ("Yes") print "Yes" print("No") print "No" temperature = int(input()) int(input()) temperature
temperature = int(input())
if temperature >= 30:
    print ("Yes")
else:
    print("No")